Trump delivered his strongest remarks yet against Tehran, saying the memorandum of understanding reached to halt the fighting was no longer valid from his perspective.The Nato summit was already shaping up to be less about military strategy than managing one man. According to reports, European allies arrived in Ankara determined to avoid a spat with US President Donald Trump, with European leaders focusing on demonstrating higher defence spending and stronger military commitments rather than reopening old disputes.Behind the scenes, diplomats had adopted what some privately described as a strategy of "Trump management"; keeping the alliance united by emphasising areas of agreement while steering clear of issues that could provoke fresh divisions. Reports have even suggested Nato is considering changes to its future summit schedule to minimise political friction with the White House.That carefully choreographed approach lasted only a few hours.Arriving in the Turkish capital, Trump blew that door open. Hours before the Summit formally began, the POTUS declared that the interim agreement with Iran was "over", reviving his demand that Greenland should be under US control rather than Denmark's, and saying he had ordered Treasury Secretary Scott Bessent to cut off all trade with Spain, calling Madrid a "terrible partner" in Nato.Trump declares Iran agreement 'over'Trump delivered his strongest remarks yet against Tehran, saying the memorandum of understanding reached to halt the fighting was no longer valid from his perspective."As far as I am concerned, it's over," he told reporters. "I don't want to deal with them anymore. They're scum... They're led by sick people... As far as I'm concerned, it's just a waste of time dealing with them."He also described Iranian leaders as "liars", "cheats" and "vicious, violent people", while defending overnight US strikes on Iranian targets."We attacked, very powerfully last night, the very dangerous people from Iran," Trump said, accusing Tehran of attacking commercial shipping despite ongoing diplomatic efforts.His remarks came after Iran launched strikes on US military sites in the Gulf following American attacks on Iranian military infrastructure and Washington's decision to reinstate sanctions on Iranian oil exports. The latest escalation has renewed concerns that the conflict could spiral into a wider regional war, with oil prices jumping after Trump's comments.Iranian Parliament Speaker Mohammad Bagher Ghalibaf accused Washington of repeatedly violating the interim agreement and insisted Tehran would not yield under military or economic pressure."The era of bullying and extortion is over. It leads nowhere. We don't fold," he wrote on X.Greenland and Spain disputes returnTrump also reignited another long-running diplomatic dispute by insisting Greenland should be under American control rather than Danish sovereignty."That should be controlled by the United States, not by Denmark," he said during a meeting with Turkish President Recep Tayyip Erdogan.He argued that Denmark had failed to adequately invest in Greenland's security despite its strategic importance, claiming Chinese and Russian vessels increasingly operated around the Arctic territory.Trump suggested the disagreement had damaged US relations within Nato, saying Washington had spent heavily protecting European allies while receiving insufficient support in return.He then turned his attention to Spain, announcing that he had instructed Treasury Secretary Scott Bessent to halt all trade with Madrid, calling Spain a "terrible partner" in the alliance. No further details were immediately provided on how or when such a move would be implemented.Nato walks a diplomatic tightropeTrump's remarks threatened to overshadow Nato's efforts to showcase billions of dollars in new defence projects, including surveillance aircraft, drones and joint procurement programmes designed to demonstrate that European allies are responding to longstanding US demands to spend more on defence.According to Politico, many European leaders entered the summit pursuing what diplomats privately described as a strategy of "Trump management" — avoiding public disagreements while highlighting increased military investment.Belgian Defence Minister Theo Francken told the publication there was "no alternative" but to approach Trump diplomatically, while one senior Nato diplomat described the objective as keeping "one person happy and satisfied".Nato Secretary-General Mark Rutte has sought to reassure Washington by unveiling new defence initiatives worth tens of billions of dollars, arguing that the alliance is converting higher military spending into real capability.